I don`t know the tool or rig for this job as we never used it. I doubt the tool was permanently fitted in the casing, more like the loading gear for the torpedo loading hatch. I assume they were rigged whenever they were used, pretty seldom I should imagine. I guess the the gear was stowed, dismantled in the casing. In the casing deck you`ll find 4 hatches just above the location for the aft and fore storagecontainers, may be they were stored in this area.
Tore